I just completed putting in the current version of the CEN 5 hp .46 engine in my Titan super deluxe that has a lot of the DUH upgrades. The truck finally runs super fast as compared to when trying other engines like the OS .21, Novarossi Top .28, XTM 24.7, Axial .28 and Ofna .21 8 port. The installation was quite easily done by just drilling 2 new threaded holes in the CEN engine mounts and adding a Savage exhaust manifold. The CEN engine is easy to find, fairly inexpensive and keeps a good tune. Now the truck is one of my most fun to run. I can put in a few pictures if someone would post instructions.